[mauser]

I don't count how many times I reload my rifle or handgun brass.
I do keep my brass in groups or lots though. When I buy new brass I keep it separate from my old brass, and in groups of 20 or 50 or whatever seems appropriate. I reload that whole group at the same time so as not to have some in a group that have been reloaded several times while others in the same group have been reloaded only a few times.
(Occasionally this requires staying at the range a little while longer to make sure an entire lot of brass is ready to reload )
I inspect them at each reloading, trim as needed and dispose of any that have imperfections such as split necks, loose primer pockets etc.
I've never discarded brass because it has been reloaded X number of times, I do discard it when it shows the slightest sign any defect.